spoofed source Email Address

[Giraldo Alonso Suárez <giraldo.alonso () cigb edu cu>]

Hi;
My network sensor notified that 0.0.0.0 send messages to my.email.relay.address

Maybe is a spoofing due to viruses ¿?
Why not appear the source address?

Has anyone any idea's, thoughts or suggestions about this behavior

Thanks in advanced
G


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